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ЖУРНАЛЫ // Письма в Журнал экспериментальной и теоретической физики // Архив

Письма в ЖЭТФ, 2008, том 87, выпуск 10, страницы 647–651 (Mi jetpl119)

Эта публикация цитируется в 66 статьях

КОНДЕНСИРОВАННЫЕ СРЕДЫ

High temperature superconductivity in transition metal oxypnictides: a rare-earth puzzle?

I. A. Nekrasova, Z. V. Pchelkinab, M. V. Sadovskiia

a Institute for Electrophysics, Ural Division, Russian Academy of Sciences, Yekaterinburg, 620016, Russia
b Institute for Metal Physics, Ural Division, Russian Academy of Sciences, Yekaterinburg, GSP-170, 620041, Russia

Аннотация: We have performed an extensive ab initio LDA and LSDA+U calculations of electronic structure of newly discovered high-temperature superconducting series ReO$_{1-x}$F$_x$FeAs (Re=La,Ce, Pr, Nd, Sm and hypothetical case of Re=Y). In all cases we obtain almost identical electronic spectrum (both energy dispersions and the densities of states) in rather wide energy interval (about 2 eV) around the Fermi level. We also clain that this fact is unlikely to be changed by the account of strong correlations. It leads inevitably to the same critical temperature $T_c$ of superconducting transition in any theoretical BCS-like mechanism of Cooper pair formation. We argue that the experimentally observed variations of $T_c$ for different rare-earth substitutions are either due to disorder effects or less probably because of possible changes in spin-fluctuation spectrum of FeAs layers caused by magnetic interactions with rare-earth spins in ReO layers.

PACS: 71.20.-b, 74.25.Jb, 74.70.-b

Поступила в редакцию: 09.04.2008

Язык публикации: английский


 Англоязычная версия: Journal of Experimental and Theoretical Physics Letters, 2008, 87:10, 560–564

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